Regenerative furnace



' y 17 A. w. soDERBERG REGENERATIVE FURNACE 'Filed June lO 1921 6 Sheets-Sheet 1 1,629056 May 171927' A.Vy/SODERBERG l REGENERATIVE FURNACE l Filed June 10. 1921 5 sheetsheet 2 f Witnesses.'

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REGENERATIVE FURNACE Filed June l0, 1921 .6 Sheets-Sheet 3 May 17, 1927. y l 1,629,056

A. w. SQDERBERG l REGENERATIVE FURNACE Filed June l0. 1921 6 sheetsheet 4 1927. 1,629,056 May 17 A. w.sQDERBERG EGENERATIVE FURNACE Filed June 1o. 1921 5 Sheets-sheet 5 Wzesses:

fnvenor:

May 17, 1927.y

A. W. SODERBERG REGENERATIVE FURNACE Filed June 1o. 1921 e sheets-sheet 6 Patented May 17, 1927.

AUNITED STATES ANDREW W. SODERBEG, OF MNHALL, PENNSYLVANIA.

REGENERATIVE FURNACE.

Application led J'une 10, 1921. Serial No. 476,517.

My invention relates to `regenerative furnaces, and particularly to means for regulating the Hou' of the incoming and outgoing gases in such furnaces, and has for one of its objects the provision of improved regulating means adapted to be incorporatediin furnaces of well known aud approved construction.

Another object is to provide novel means for operating said regulating means when it is desired to. reverse the furnace.

Still another object is to provide a furnace regulating means having the novel c ol'lstruetions. combinations. and arrangement of parts illustrated in the aecol'npanying drawings, describedy in the following specification and particularly pointed out in the claims.

Referring to thel drawings, Figure 1 is a top plan view of a regenerative furnace having my invention applied thereto.

Figure 2 is a rear view thereof.

Figure 3 is a sectional plan thereof.

Figure 4 is a side elevation thereof. A

Figure 5 is a longitudinal sectional elevation thereof.

Figure 6 is across sectional elevation on the line 'VI-VI of Figure 5.

Figure f7 is a detail sectional elevation of one of the reversing valves.

Referring more particularly to the drawings, the furnace illustrated therein is of a well known'and approved design consisting of side Walls 2. end Kvalls 3, top 4 and hearth 5. A wide air port 6 and a'combined air and gas port 7 are arranged at each end of the furnace, the combined air and gas port 7 being below the Wide air portfivvhich extends across the Whole Width of the furnace. v

The furnace is of duplicate construction at each end, therefore the detailed description of one end will sufice for both, and the same reference numerals will be applied to duplicate parts at both ends.

The air port (i is connected to a slag pocket 9 by vertical flues 1()v and 11 which connnunicate with the port adjacent the sides thereof. and the, combined airand gas port 7 is connectedto the slag pocket 9 by a vertical Hue 12.

Horizontal passageways or flues 13 and 14 connect the slag pocket 9 with regenen' ators15 and 16 respectively, which are connected by horizontal passageways or 1T and 185 respect ively,` through valves 19 fluesing baille 43 in the body and to the stack flue 21 or branch air flue 22 according to the posltlon of the valves. The branch air. flue 22 1s connect-ed to a main air flue 23 leading from a blower or fan 24. and the stack fines lead to and comniunicate with a stack 25.

The valves 19 and 20 are of duplicate construction vand comprise a housing 26 having itsl bottom end in conununication with the stack flue 21. and an extension or leanto portion 27 in` communication with the tlue leading to the regenerator.

' 'lhey valve housing 26 is provided intermediate its ends vvith a .valve seat 28 and at its lower end at the point of communication` with the stack flue 21 with a second valve seat 2f). A vertically movable valve S0 is mounted on a stem 31 in the housing 2G and is adapted to be moved vertically by screwing the hand Wheel 32 so as to seat on either of the valve seats 28 or 29.

The branch air flue 22 communicates with the valve housing 26 at a point above the valve seat 28, thereforeif the valve .30 be moved vertically and seated, against the seat 28' the air cannot flow through the valve to the flues entering the regenerators, but thcvalve will be open for communication to the stack, which is the position of the valves on the discharge end of the-furnace. However, the valves on the tiring end of the furnace will be seated against seats 29 so that communication with the stack ywill be shut off and communie-ation will be opened from the air fines to the regenen ators.

Gas is admitted to the combined air and gas port 7 through suitable burner ports 34, which extend from the side of the furnace into the port 7 and have gas pipes or mains 35 entering an The mains 35 are provided with suitable valves 36 for controlling the supply or volume of gas, andare connected with a sup- 'ply main 37.

The air flues slag or valves 39 and 39, respectively, of the butterfly type, which are preferably of the Water cooled cast type,

appreciable distance therein.

10 and 11 leading from the I pocket- 9 are provided with dampersand comprise a hollovv body lportion 40 and an integral hollow trunnion 41. An integral dividing or circulation Wall 42 extends centrally through the trunnion 41 and joins a dividof the valve which terminates short of the ends thereof to allow circulation therearound. The trunnion 41 is provided with inlet and outlet ports counected with Water pipes 44 and 45 to provide circulation of cooling water through the one. side of the trunnion into the valve body around the baffle 43 and out through the other side of thc trunnion 41.

The 'valve has its trunnion 41 journaled in a suitable water cooled hearing4 46 mounted in the furnact` side wall.

A water cooled valve seat 47 is mounted in and is flush with the walls of the air lues 10 and 11 and the valve bodies 4() are adapted to aline therewith when they are in closed position.

The valve .seat 47 is formed integral with the hearing 46 and is provided with water circulation pipes 48 and 49 which are. cast therein and consequently form an integral part thereof. i.

A's shown. the valves40 are located only vin the air tlues 10 and 11. but when found desirable or necessary an additional valve 40 will be provided in the central flue y12. The location of" the valves 40 may be changed from that shown to any suitable point in the length of the flues between the regenerators and the furnace hearth.

The side walls 2 of the furnace are provided With arches 50 at a point abovev the valve seat 47 which arches extend the entire Width of the i'ues 10 and 11 and provide for removal of the portion of theside wall immediately surrounding the valve seat and valve to allow for repairs or replacement, without materially interfering with the operation of the furnace.

The valves 39 and 39a at. each end of the furnace are eonnectedrtogetherby a system of levers and operated simultaneously by a pair of single acting: hydraulic cylinders 52.

and 53. A crank arm 54 is secured on the trunnion 41 of the valve 39 and connected by a link 55 to a lcrank arm 56 on a connecting shaft 57 extending across the end of the furnace journaled in suitable bearings 58.

A crank arm 59 is secured to the other end of the shaft 57 and is connected by a link 60 to'one end of a lever arm 61. secured intermediate its ends to the trunnion 41 of valve 39@l and having fits other end. secured to the piston rod 62 of the pair of cylinders 52. 53. The cylinders 52 and-53 at each end of the furnace have their inlet ports connected together hy pipes 63.64, so that fluid will enter both cylinders 52 and both cylinders 53 simultaneously7 thus operating the Valves at each end of! the furnace at the same time. It will be understood 'that when thc Valves are assembled the valves at one end are as# sembled' in thc reverse position to the valves at the other end, that is, the valves at one' 'endare assemb/led in their open position, while the valves at the other end are assemand outlet pipes 68 and 69 communicating Y'f therewith.

lt will he understood that single acting cylinders of the design used in operating the valves 39 and 39 only have a single port which is connected with the pressure pipe. However, as the liuid pressure -is forced into one cylinder the piston moves'into thev other cylinder and forcesv the fluid outl through the port of that cylinder through which it entered. The. control of the Huid pressure and exhaust fluid is governed entirely by the four-way valve 67.

While I have shown 'fluid cylinders for operatingPA the `valves 39 and 39a, other mechanism may readily be employed, such as a system of hand levers, or electric motors.

Those skilled in the art willy readilyl sce that I have provided a system of damper controls, for the air fines of open hearth furnaces that may readily be applied to 'existing furnace constructionsWithout niaterially altering their design.

The pipes 63 and 64 are con-` The operation' of the furnace is as follows: Assuming that the valves 39 and 39a are in the position shown in the accompany! ing drawings, the furnace will be fired at the end in which the valves are closed, since` less port and flue area is needed to admitsufficient air to support combustion, than is necessary to allow the escape of the products of combustion.

Air will be forced through the regenerators 15 and 16 communicating with the air ports of the end of the furnace being fired, and gas will be admitted through the burner ports 34, thus forming a combustible mixture, the .proportions of which may be varied by regulating the valves 39, 39, and the products of combustion will pass out through the lports at the opposite end of the furnace.

When it is desired to reverse the furnace, thel valves 19 and 20, controlling both sets of regenerators 15 and 16, are reversed and the gas is shut oi from the burner ports in the firing; end of the furnace and turned on inthe burner ports at the other end. The fluid pressure is thenturned into the cylinders 52 at each end of the. furnace and the position of the valves 39, 39l reversed in accordance ywith the reversal of the firing of the furnace.

, Various modifications and changes in design and combna'tioniof parts will 'readily lou suggest themselves to those skilled in the art and may be made Without departing from the spirit of my invention as defined in the appended claims.

1. In a regenerative open hearth furnace .ends of said furnace.

2. The combination wlth a regenerative furnace vhavlng aY plurality of air fines at each lend thereof, of means for controlling the How of air through some of said flues,l

said means comprising water cooled butterfly valves having integral trunnions journaled in Water cooled hearings mounted in the side walls of said furnace, and means for simultaneously operating the valves at both ends of said furnace. v

3. The combination with a regenerative furnace having a plurality of air ues at each end thereof, of Water cooled butterfly valves mounted in sai lues for controlling the flow of air throug said flues, operating levers connecting the alves at each end of the furnace, and means for simultaneously operating the operating levers at both ends of said furnaces. v

l.The Combination witha regenerative furnace -having a plurality of air lues at each end thereof, of hollow water cooled butterfly valves mounted in said lues for controlling the flow of air through sai Jlues said valves being provided with integral trunnion A members journaled in suitable bearings mounted in the side walls of said furnace, means for operating said valves, and water cooled valve seats rlgidly mounted `in the side walls of said lues.

5. The combination with a regenerative furnace having a plurality vof air "lues 'at cach end thereof, of hollow water cooled butterfly valves mounted 'in said lues for controlling the ovv of air through said flues, .said `valves being provided with integral trunnion members journaled in` suitable bearings mounted in the side walls of said furnace, water cooledy valve seats .rigidly mounted in and flushfwith the side Walls of said flues, operating levers connecting the valves at each end of the furnace, and fluid operatedcylimlers for simultaneously mov ing said'operating levers at each end of said furnace to -reverse the valves.

In testimony whereof I have hereunto set my hand.

ANDREW W. SODRBERG.

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position of said' 

